Techniques for control resource set (coreset) configuration for shared radio frequency spectrum

Abstract

To provide techniques for a control resource set (CORESET) configuration for a shared radio frequency spectrum.SOLUTION: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, user equipment (UE) may receive an indication of a configuration for a control resource set (CORESET) of a shared radio frequency spectrum carrier. The UE may identify a bitmap included in the configuration. Each bit in the bitmap may be associated with a respective control resource block group. The UE may identify, based at least in part on a value for each bit in the bitmap, one or more control resource block groups that are included in the CORESET. The UE may monitor downlink communications in the one or more control resource block groups. Numerous other aspects are provided.SELECTED DRAWING: Figure 5B

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Application No. 62 / 808,732, entitled "TECHNIQUES FOR CORE RESOURCE SET (CORESET) CONFIGURATION FOR SHARED RADIO FREQUENCY SPECTRUM," filed February 21, 2019, and U.S. Non-Provisional Application No. 16 / 793,836, entitled "TECHNIQUES FOR CONTROL RESOURCE SET (CORESET) CONFIGURATION FOR SHARED RADIO FREQUENCY SPECTRUM," filed February 18, 2020, which are hereby expressly incorporated by reference.

[0002] Aspects of the present disclosure relate generally to wireless communications, and more particularly, to techniques and apparatus for control resource set (CORESET) configuration for a shared radio frequency spectrum. [Background technology]

[0003] Wireless communication systems have been widely deployed to provide various telecommunication services, such as telephone, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the 3rd Generation Partnership Project (3GPP®).

[0004] A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipments (UEs). The user equipments (UEs) may communicate with the base stations (BSs) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0005] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that allow various user equipment to communicate at city, national, regional, and even global levels. New Radio (NR), sometimes referred to as 5G, is a set of extensions to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP®). NR is designed to improve spectral efficiency, lower costs, improve services, take advantage of new spectrum, and better support mobile broadband Internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDM (also known as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, further improvements to LTE and NR technologies are needed, and preferably these improvements should be applicable to other multiple access technologies and telecommunications standards that employ these technologies. Summary of the Invention [Means for solving the problem]

[0006] In some aspects, a method of wireless communication performed by a user equipment (UE) may include receiving an indication of a configuration for a control resource set (core set) of a shared radio frequency spectrum carrier; identifying a bitmap included in the configuration, where each bit in the bitmap is associated with a respective control resource block group; identifying one or more control resource block groups included in the core set based at least in part on a value for each bit in the bitmap; and monitoring for downlink communications among the one or more control resource block groups.

[0007] In some aspects, the UE is configured with information identifying the number of resource blocks included in each respective control resource block group. In some aspects, the UE is configured with information identifying, for each control resource block group, a respective starting resource block in the associated shared radio frequency spectrum bandwidth and a respective ending resource block in the associated shared radio frequency spectrum bandwidth. In some aspects, a control resource block group of the one or more control resource block groups is positioned off-center in the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0008] In some aspects, the indication of the configuration is included in at least one of a radio resource control (RRC) communication, a medium access control control element (MAC-CE) communication, or a downlink control information (DCI) communication. In some aspects, the method further comprises receiving a physical downlink control channel (PDCCH) communication in the core set based at least in part on monitoring for downlink communication in the one or more control resource block groups.

[0009] In some aspects, the method further comprises identifying a synchronization signal block (SSB) transmitted for a first shared radio frequency spectrum bandwidth of the shared radio frequency spectrum carrier, identifying an initial control resource block group associated with the first shared radio frequency spectrum bandwidth, performing an initial access procedure using the initial control resource block group, and receiving an indication of a configuration for a core set based at least in part on the initial access procedure. In some aspects, performing the initial access procedure using the initial control resource block group comprises receiving a PDCCH communication in the initial control resource block group during the initial access procedure.

[0010] In some aspects, the method further comprises receiving a first demodulation reference signal (DMRS) in an initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum bandwidth, and receiving a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0011] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS that transmitted the configuration indication to the core set, the timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with that BS, the timing of the transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth.

[0012] In some aspects, each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth, In some aspects, an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0013] In some aspects, a method of wireless communication performed by a base station (BS) may include transmitting an indication of a configuration for a core set for a shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap being associated with a respective control resource block group, the bitmap indicating one or more control resource block groups included in the core set, and transmitting a downlink communication in the control resource block group of the one or more control resource block groups.

[0014] In some aspects, the BS is configured with information identifying the number of resource blocks included in each of one or more control resource block groups. In some aspects, the BS is configured with information identifying, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth and a respective ending resource block within the associated shared radio frequency spectrum bandwidth. In some aspects, the control resource block groups are positioned off-center within the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0015] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the method further comprises transmitting an SSB for the first shared radio frequency spectrum bandwidth and performing an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth, where performing the initial access procedure using the first control resource block group comprises transmitting a physical downlink control channel (PDCCH) communication in the initial control resource block group during the initial access procedure. In some aspects, the method further comprises transmitting a first DMRS in the initial control resource block group, where the first DMRS is scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum channel, and transmitting a second DMRS in the control resource block group, where the second DMRS is scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0016] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth. In some aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for the associated shared radio frequency spectrum bandwidth. In some aspects, a starting resource block for the first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of a starting resource block for the second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0017] In some aspects, a UE for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to receive an indication of a configuration for a core set of shared radio frequency spectrum carriers, identify a bitmap included in the configuration, where each bit in the bitmap is associated with a respective control resource block group, identify one or more control resource block groups included in the core set based at least in part on a value for each bit in the bitmap, and monitor for downlink communication among the one or more control resource block groups.

[0018] In some aspects, the UE is configured with information identifying the number of resource blocks included in each respective control resource block group. In some aspects, the UE is configured with information identifying, for each control resource block group, a respective starting resource block in the associated shared radio frequency spectrum bandwidth and a respective ending resource block in the associated shared radio frequency spectrum bandwidth. In some aspects, a control resource block group of the one or more control resource block groups is positioned off-center in the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0019] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the one or more processors are further configured to receive a PDCCH communication in the core set based at least in part on monitoring for downlink communication in the one or more control resource block groups.

[0020] In some aspects, the one or more processors are further configured to identify an SSB to be transmitted on a first shared radio frequency spectrum bandwidth of the shared radio frequency spectrum carrier, identify an initial control resource block group associated with the first shared radio frequency spectrum bandwidth, perform an initial access procedure using the initial control resource block group, and receive a configuration indication for the core set based at least in part on the initial access procedure. In some aspects, performing the initial access procedure using the initial control resource block group comprises receiving a PDCCH communication in the initial control resource block group during the initial access procedure.

[0021] In some aspects, the one or more processors are further configured to receive a first DMRS in an initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum bandwidth, and receive a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0022] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS that transmitted the configuration indication to the core set, the timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with that BS, the timing of the transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth.

[0023] In some aspects, each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth, In some aspects, an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0024] In some aspects, a BS for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to transmit an indication of a configuration for a core set for a shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap being associated with a respective control resource block group, the bitmap indicating one or more control resource block groups included in the core set, and to transmit a downlink communication in the control resource block group of the one or more control resource block groups.

[0025] In some aspects, the BS is configured with information identifying the number of resource blocks included in each of one or more control resource block groups. In some aspects, the BS is configured with information identifying, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth and a respective ending resource block within the associated shared radio frequency spectrum bandwidth. In some aspects, the control resource block groups are positioned off-center within the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0026] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the one or more processors are further configured to transmit an SSB for the first shared radio frequency spectrum bandwidth and perform an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth, where performing the initial access procedure using the first control resource block group comprises transmitting a PDCCH communication in the initial control resource block group during the initial access procedure. In some aspects, the one or more processors are further configured to transmit a first DMRS in the initial control resource block group, where the first DMRS is scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum channel, and transmit a second DMRS in the control resource block group, where the second DMRS is scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0027] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth. In some aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for the associated shared radio frequency spectrum bandwidth. In some aspects, a starting resource block for the first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of a starting resource block for the second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0028] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communications, which, when executed by one or more processors of a UE, may cause the one or more processors to receive an indication of a configuration for a core set of shared radio frequency spectrum carriers, identify a bitmap included in the configuration, where each bit in the bitmap is associated with a respective control resource block group, identify one or more control resource block groups included in the core set based at least in part on a value for each bit in the bitmap, and monitor for downlink communications among the one or more control resource block groups.

[0029] In some aspects, the UE is configured with information identifying the number of resource blocks included in each respective control resource block group. In some aspects, the UE is configured with information identifying, for each control resource block group, a respective starting resource block in the associated shared radio frequency spectrum bandwidth and a respective ending resource block in the associated shared radio frequency spectrum bandwidth. In some aspects, a control resource block group of the one or more control resource block groups is positioned off-center in the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0030] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to receive a PDCCH communication in the core set based at least in part on monitoring for downlink communication in the one or more control resource block groups.

[0031] In some aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to identify an SSB to be transmitted on a first shared radio frequency spectrum bandwidth of the shared radio frequency spectrum carrier, identify an initial control resource block group associated with the first shared radio frequency spectrum bandwidth, perform an initial access procedure using the initial control resource block group, and receive a configuration indication for the core set based at least in part on the initial access procedure. In some aspects, performing the initial access procedure using the initial control resource block group comprises receiving a PDCCH communication in the initial control resource block group during the initial access procedure.

[0032] In some aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to receive a first DMRS in the initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum bandwidth, and receive a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0033] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS that transmitted the configuration indication to the core set, the timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with that BS, the timing of the transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth.

[0034] In some aspects, each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth, In some aspects, an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0035] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication, which when executed by one or more processors of a BS may cause the one or more processors to transmit an indication of a configuration for a core set for a shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap being associated with a respective control resource block group, the bitmap indicating one or more control resource block groups included in the core set, and to transmit a downlink communication in the control resource block group of the one or more control resource block groups.

[0036] In some aspects, the BS is configured with information identifying the number of resource blocks included in each of one or more control resource block groups. In some aspects, the BS is configured with information identifying, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth and a respective ending resource block within the associated shared radio frequency spectrum bandwidth. In some aspects, the control resource block groups are positioned off-center within the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0037] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to transmit an SSB for the first shared radio frequency spectrum bandwidth and perform an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth, where performing the initial access procedure using the first control resource block group comprises transmitting a PDCCH communication in the initial control resource block group during the initial access procedure. In some aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to transmit a first DMRS in the initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum channel, and to transmit a second DMRS in the control resource block group, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0038] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth. In some aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for the associated shared radio frequency spectrum bandwidth. In some aspects, a starting resource block for the first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of a starting resource block for the second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0039] In some aspects, an apparatus for wireless communication may include means for receiving an indication of a configuration for a core set of a shared radio frequency spectrum carrier; means for identifying a bitmap included in the configuration, where each bit in the bitmap is associated with a respective control resource block group; means for identifying one or more control resource block groups included in the core set based at least in part on a value for each bit in the bitmap; and means for monitoring for downlink communication among the one or more control resource block groups.

[0040] In some aspects, the apparatus is configured with information identifying a number of resource blocks included in each respective control resource block group. In some aspects, the apparatus is configured with information identifying, for each respective control resource block group, a respective starting resource block in the associated shared radio frequency spectrum bandwidth and a respective ending resource block in the associated shared radio frequency spectrum bandwidth. In some aspects, a control resource block group of the one or more control resource block groups is positioned off-center in the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0041] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the one or more processors are further configured to receive a PDCCH communication in the core set based at least in part on monitoring for downlink communication in the one or more control resource block groups.

[0042] In some aspects, the apparatus further comprises means for identifying an SSB transmitted for a first shared radio frequency spectrum bandwidth of the shared radio frequency spectrum carrier, means for identifying an initial control resource block group associated with the first shared radio frequency spectrum bandwidth, means for performing an initial access procedure using the initial control resource block group, and means for receiving an indication of a configuration for the core set based at least in part on the initial access procedure. In some aspects, performing the initial access procedure using the initial control resource block group comprises receiving a PDCCH communication in the initial control resource block group during the initial access procedure.

[0043] In some aspects, the apparatus further comprises means for receiving a first DMRS in an initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum bandwidth, and means for receiving a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0044] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS that transmitted the configuration indication to the core set, the timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with that BS, the timing of the transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth.

[0045] In some aspects, each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth, In some aspects, an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0046] In some aspects, an apparatus for wireless communication may include means for transmitting an indication of a configuration for a core set for a shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap associated with a respective control resource block group, the bitmap indicating one or more control resource block groups included in the core set, and means for transmitting a downlink communication in a control resource block group of the one or more control resource block groups.

[0047] In some aspects, the apparatus is configured with information identifying a number of resource blocks included in each of one or more control resource block groups. In some aspects, the apparatus is configured with information identifying, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth and a respective ending resource block within the associated shared radio frequency spectrum bandwidth. In some aspects, the control resource block groups are positioned off-center within the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0048] In some aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the apparatus further comprises means for transmitting an SSB for the first shared radio frequency spectrum bandwidth and means for performing an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth, where performing the initial access procedure using the first control resource block group comprises transmitting a PDCCH communication in the initial control resource block group during the initial access procedure. In some aspects, the apparatus further comprises means for transmitting a first DMRS in the initial control resource block group, where the first DMRS is scrambled based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum channel, and means for transmitting a second DMRS in the control resource block group, where the second DMRS is scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0049] In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the device, a timing of transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the device, a timing of transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth. In some aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for the associated shared radio frequency spectrum bandwidth. In some aspects, a starting resource block for the first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of a starting resource block for the second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0050] In some aspects, a method of wireless communication performed by a UE may include identifying an SSB transmitted for a first shared radio frequency spectrum channel, identifying a first control resource block group associated with the first shared radio frequency spectrum channel, performing an initial access procedure using the first control resource block group, and receiving an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on the initial access procedure, where the indication of the core set identifies the first control resource block group configured for the first shared radio frequency spectrum channel and the second control resource block group configured for the second shared radio frequency spectrum channel.

[0051] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory for: identifying an SSB to be transmitted for a first shared radio frequency spectrum channel; identifying a first control resource block group associated with the first shared radio frequency spectrum channel; performing an initial access procedure using the first control resource block group; and receiving an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on the initial access procedure, where the indication of the core set identifies a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0052] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communications, which, when executed by one or more processors of a UE, may cause the one or more processors to identify an SSB to be transmitted for a first shared radio frequency spectrum channel, identify a first control resource block group associated with the first shared radio frequency spectrum channel, perform an initial access procedure using the first control resource block group, and receive, based at least in part on the initial access procedure, an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel, where the indication of the core set identifies the first control resource block group configured for the first shared radio frequency spectrum channel and the second control resource block group configured for the second shared radio frequency spectrum channel.

[0053] In some aspects, an apparatus for wireless communication may include means for identifying an SSB transmitted for a first shared radio frequency spectrum channel, means for identifying a first control resource block group associated with the first shared radio frequency spectrum channel, means for performing an initial access procedure using the first shared radio frequency spectrum channel, and means for receiving an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on the initial access procedure, the indication of the core set identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0054] In some aspects, a method of wireless communication performed by a BS may include transmitting an SSB for a first shared radio frequency spectrum channel and transmitting an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on an initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, the core set indication identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0055] In some aspects, a BS for wireless communication may include a memory and one or more processors coupled to the memory for: transmitting SSBs for a first shared radio frequency spectrum channel; and transmitting an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on an initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, wherein the core set indication identifies a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0056] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication, which when executed by one or more processors of a BS may cause the one or more processors to transmit an SSB for a first shared radio frequency spectrum channel and transmit an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on an initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, the indication of the core set identifying the first control resource block group configured for the first shared radio frequency spectrum channel and the second control resource block group configured for the second shared radio frequency spectrum channel.

[0057] In some aspects, an apparatus for wireless communication may include means for transmitting an SSB for a first shared radio frequency spectrum channel and means for transmitting an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on an initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, the core set indication identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0058] Aspects include generally methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems, as fully described herein with reference to and as illustrated by the accompanying drawings and this specification.

[0059] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages are described below. The concepts and examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in conjunction with the accompanying figures. Each of the figures is provided for the purpose of illustration and explanation, and not as a definition of the limits of the claims.

[0060] So that the above-mentioned features of the present disclosure may be understood in detail, a more detailed description, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the accompanying drawings. However, since the present description may admit of other equally effective embodiments, it should be noted that the accompanying drawings illustrate only some typical embodiments of the present disclosure and therefore should not be considered as limiting its scope. The same reference numbers in different drawings may identify the same or similar elements. [Brief description of the drawings]

[0061] [Figure 1] FIG. 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure. [Diagram 2] FIG. 1 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network, in accordance with various aspects of the present disclosure. [Figure 3A] FIG. 2 is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with various aspects of the present disclosure. [Figure 3B] FIG. 1 is a block diagram conceptually illustrating an example synchronous communication hierarchy in a wireless communication network, in accordance with various aspects of the present disclosure. [Figure 4] FIG. 1 is a block diagram conceptually illustrating an example slot format with a normal cyclic prefix, in accordance with various aspects of the present disclosure. [Figure 5A] FIG. 2 illustrates an example of a control resource set (core set) configuration for a shared radio frequency spectrum, in accordance with various aspects of the present disclosure. [Figure 5B] FIG. 2 illustrates an example of a control resource set (core set) configuration for a shared radio frequency spectrum, in accordance with various aspects of the present disclosure. [Figure 5C] FIG. 2 illustrates an example of a control resource set (core set) configuration for a shared radio frequency spectrum, in accordance with various aspects of the present disclosure. [Figure 6]FIG. 2 illustrates an example process performed, for example, by a user equipment (UE), in accordance with various aspects of the present disclosure. [Figure 7] FIG. 2 illustrates an example process performed, for example, by a base station (BS), in accordance with various aspects of the present disclosure. [Figure 8] 1 illustrates an example process, eg, performed by a UE, in accordance with various aspects of the present disclosure. [Figure 9] FIG. 2 illustrates an example process performed, for example, by a BS, in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0062] Various aspects of the present disclosure will be described more fully below with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout the present disclosure. Rather, these aspects are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should understand that the scope of the present disclosure encompasses any aspect of the present disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects described herein. In addition, the scope of the present disclosure encompasses such an apparatus or method practiced using other structures, functions, or structures and functions in addition to or other than the various aspects of the present disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of a claim.

[0063] Several aspects of a telecommunications system are now presented with reference to various apparatus and techniques that are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and the like (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0064] Although aspects may be described herein using terminology commonly associated with 3G and / or 4G wireless technology, it should be noted that aspects of the disclosure may be applied in other generation-based communication systems, such as 5G and beyond, including NR technology.

[0065] FIG. 1 illustrates a wireless network 100 in which aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of ​​a BS and / or a BS subsystem serving this coverage area, depending on the context in which the term is used.

[0066] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a few kilometers in radius) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs that have an association with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. 1, BS 110a may be a macro BS for a macro cell 102a, BS 110b may be a pico BS for a pico cell 102b, and BS 110c may be a femto BS for a femto cell 102c. A BS may support one or multiple (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” may be used interchangeably herein.

[0067] In some aspects, the cells may not necessarily be stationary and the geographic area of ​​the cells may move according to the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as direct physical connections, virtual networks, etc., using any suitable transport network.

[0068] Wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in FIG. 1, relay station 110d may communicate with BS 110a and UE 120d to facilitate communication between macro BS 110a and UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, etc.

[0069] Wireless network 100 may be a heterogeneous network including different types of BSs, e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different susceptibility to interference in wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5-40 watts), while a pico BS, femto BS, and relay BS may have a lower transmit power level (e.g., 0.1-2 watts).

[0070] A network controller 130 may couple to a set of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, e.g., via wireless or wireline backhaul.

[0071] The UEs 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be fixed or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or satellite radio), a vehicle component or vehicle sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate over a wireless or wired medium.

[0072] Some UEs may be considered as machine-type communication (MTC) UEs or enhanced machine-type communication (eMTC) UEs. MTC UEs and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered as Customer Premises Equipment (CPE). The UE 120 may be included inside a housing that houses components of the UE 120, such as a processor component, a memory component, etc.

[0073] In general, any number of wireless networks may be deployed within a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequencies may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT within a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0074] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using the base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which may include, e.g., vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0075] As noted above, Figure 1 is provided as an example. Other examples may differ from those described with respect to Figure 1.

[0076] 2 shows a block diagram of a design 200 of a base station 110 and a UE 120, which may be one of the base stations and one of the UEs in FIG. 1. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0077] At the base station 110, the transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols to all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, higher layer signaling, etc.) and provide overhead and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.According to various aspects described in more detail below, the synchronization signal can be generated using location encoding to convey additional information.

[0078] At the UE 120, the antennas 252a-252r may receive downlink signals from the base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a-254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols and provide decoded data for the UE 120 to a data sink 260 and may provide decoded control and system information to the controller / processor 280. The channel processor may determine a reference signal received power (RSRP), a received signal strength indicator (RSSI), a reference signal received quality (RSRQ), a channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included within a housing.

[0079] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc.) from the controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a-254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by antennas 234, processed by demodulator 232, detected by a MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0080] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other components of FIG. 2 may perform one or more techniques related to control resource set (core set) configuration for a shared radio frequency spectrum, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other components of FIG. 2 may perform or direct the operation of, for example, process 600 of FIG. 6, process 700 of FIG. 7, and / or other processes as described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0081] In some aspects, the UE 120 may include means for identifying an SSB transmitted for a first shared radio frequency spectrum channel, means for identifying a first control resource block group associated with the first shared radio frequency spectrum channel, means for performing an initial access procedure using the first control resource block group, and means for receiving an indication of a core set for the first shared radio frequency spectrum channel and a second shared radio frequency spectrum channel based at least in part on the initial access procedure, the indication of the core set identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel, etc. In some aspects, the UE 120 may include means for receiving an indication of a configuration for a core set of shared radio frequency spectrum carriers, means for identifying a bitmap included in a search space set configuration, each bit in the bitmap being associated with a respective control resource block group, means for identifying one or more control resource block groups included in the core set based at least in part on a value per bit in the bitmap, means for monitoring for downlink communications among the one or more control resource block groups, etc. In some aspects, such means may include one or more components of the UE 120 described with respect to FIG.

[0082] In some aspects, the base station 110 may include means for transmitting SSBs for the first shared radio frequency spectrum channel, and means for transmitting an indication of a core set for the first shared radio frequency spectrum channel and the second shared radio frequency spectrum channel based at least in part on the initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, the indication of the core set identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel, etc. In some aspects, the base station 110 may include means for transmitting an indication of a configuration for a core set for the shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap being associated with a respective control resource block group, the bitmap indicating one or more control resource block groups included in the core set, means for transmitting downlink communication in the control resource block group of the one or more control resource block groups, etc. In some aspects, such means may include one or more components of the base station 110 described with respect to FIG. 2.

[0083] As noted above, Figure 2 is provided as an example. Other examples may differ from those described with respect to Figure 2.

[0084] FIG. 3A illustrates an example frame structure 300 for frequency division duplexing (FDD) in a telecommunications system (e.g., NR). The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into a set of Z subframes (e.g., with indices 0 to Z-1), where Z≧1. Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of slots (e.g., 2 slots per subframe). m slots are shown in FIG. 3A, where m is the numerology used for transmission, such as 0, 1, 2, 3, 4, etc.). Each slot may include a set of L symbol periods. For example, each slot may include 14 symbol periods (e.g., as shown in FIG. 3A), 7 symbol periods, or another number of symbol periods. If a subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices from 0 to 2L-1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0085] Although some techniques are described herein with respect to frames, subframes, slots, etc., these techniques may be equally applicable to other types of wireless communication structures, which in 5G NR may be referred to using terms other than "frame," "subframe," "slot," etc. In some aspects, a wireless communication structure may refer to a periodic, time-limited communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, a wireless communication structure of a different configuration than that shown in FIG. 3A may be used.

[0086] In some telecommunications (e.g., NR), a base station may transmit synchronization signals. For example, a base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), etc. on the downlink for each cell supported by the base station. The PSS and SSS may be used by the UE for cell search and cell acquisition. For example, the PSS may be used by the UE to determine symbol timing, and the SSS may be used by the UE to determine a physical cell identifier associated with the base station, and frame timing. The base station may also transmit a physical broadcast channel (PBCH). The PBCH may carry some system information, such as system information supporting initial access by the UE.

[0087] In some aspects, the base station may transmit the PSS, SSS, and / or PBCH according to a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) that includes multiple synchronization communications (e.g., SS blocks), as described below with respect to FIG. 3B.

[0088] FIG. 3B is a block diagram conceptually illustrating an exemplary SS hierarchy, which is an example of a synchronous communications hierarchy. As shown in FIG. 3B, the SS hierarchy may include an SS burst set, which may include a number of SS bursts (identified as SS burst 0 through SS burst B-1, where B is the maximum number of repetitions of an SS burst that may be transmitted by a base station). As further shown, each SS burst may include one or more SS blocks (SS block 0 through SS block (b max_SS-1 ), where b max_SS-1The SS burst set may include a fixed or dynamic length, shown in FIG. 3B as Y milliseconds. In some aspects, the .... In some aspects, the SS burst set may include a fixed or dynamic length. In some aspects, the SS burst set may include a fixed or dynamic length.

[0089] The SS burst set shown in Figure 3B is one example of a synchronous communication set, and other synchronous communication sets may be used in conjunction with the techniques described herein. Additionally, the SS block shown in Figure 3B is one example of a synchronous communication set, and other synchronous communication sets may be used in conjunction with the techniques described herein.

[0090] In some aspects, an SS block includes resources carrying a PSS, SSS, PBCH, and / or other synchronization signals (e.g., a tertiary synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS, and / or PBCH may be the same across each SS block of the SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, an SS block may be at least four symbol periods in length, where each symbol carries one or more of a PSS (e.g., occupying one symbol), an SSS (e.g., occupying one symbol), and / or a PBCH (e.g., occupying two symbols).

[0091] In some aspects, the symbols of an SS block are contiguous, as shown in FIG. 3B. In some aspects, the symbols of an SS block are not contiguous. Similarly, in some aspects, one or more SS blocks of an SS burst may be transmitted in contiguous radio resources (e.g., contiguous symbol periods) during one or more slots. Additionally or alternatively, one or more SS blocks of an SS burst may be transmitted in non-contiguous radio resources.

[0092] In some aspects, an SS burst may have a burst duration, whereby an SS block of an SS burst is transmitted by a base station according to the burst duration. In other words, an SS block may be repeated during each SS burst. In some aspects, an SS burst set may have a burst set periodicity, whereby an SS burst of an SS burst set is transmitted by a base station according to a fixed burst set periodicity. In other words, an SS burst may be repeated during each SS burst set.

[0093] A base station may transmit system information, such as a system information block (SIB), on a physical downlink shared channel (PDSCH) in some slots. The base station may transmit control information / data on a physical downlink control channel (PDCCH) in C symbol periods of the slot, where B may be configurable per slot. The base station may transmit traffic data and / or other data on the PDSCH in the remaining symbol periods of each slot.

[0094] As noted above, Figures 3A and 3B are provided as examples, and other examples may differ from those described with respect to Figures 3A and 3B.

[0095] 4 shows an example slot format 410 with a normal cyclic prefix. The available time-frequency resources may be partitioned into resource blocks. Each resource block may cover a set of subcarriers (e.g., 12 subcarriers) in one slot and may contain several resource elements. Each resource element may cover one subcarrier in one symbol period (e.g., in time) and may be used to send one modulation symbol, which may be real or complex valued.

[0096] In some telecommunication systems (e.g., NR), an interlace structure may be used for each of the downlink and uplink for FDD. For example, Q interlaces with indices 0 to Q-1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include slots spaced apart by Q frames. In particular, interlace q may include slots q, q+Q, q+2Q, etc., where q∈{0,...,Q-1}.

[0097] A UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria, such as received signal strength, received signal quality, path loss, etc. The received signal quality may be quantified by a signal-to-noise-and-interference ratio (SINR) or a reference signal received quality (RSRQ), or some other metric. The UE may operate in a dominant interference scenario, where the UE may observe significant interference from one or more interfering BSs.

[0098] Although example aspects described herein may relate to NR or 5G technologies, aspects of the present disclosure may be applicable with other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., other than an Orthogonal Frequency Division Multiple Access (OFDMA)-based air interface) or a fixed transport layer (e.g., other than Internet Protocol (IP)). In aspects, NR may utilize OFDM with CP (referred to herein as Cyclic Prefix OFDM or CP-OFDM) and / or SC-FDM on the uplink, CP-OFDM on the downlink, and may include support for half-duplex operation using Time Division Duplex (TDD). In aspects, NR may employ, for example, OFDM with CP (referred to herein as CP-OFDM) and / or Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) on the uplink and CP-OFDM on the downlink and may include support for half-duplex operation using TDD. NR may include Enhanced Mobile Broadband (eMBB) services targeting wide bandwidths (e.g., 80 megahertz (MHz) and above), millimeter wave (mmW) targeting high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC techniques, and / or Mission Critical targeting ultra reliable low latency communication (URLLC) services.

[0099] In some aspects, a single component carrier bandwidth of 100 MHz may be supported. An NR resource block may span 12 subcarriers with a subcarrier bandwidth of 60 or 120 kilohertz (kHz) over a duration of 0.1 milliseconds (ms). Each radio frame may include 40 slots and may be 10 ms long. Thus, each slot may be 0.25 ms long. Each slot may indicate a link direction (e.g., DL or UL) for data transmission, and the link direction per slot may be dynamically switched. Each slot may include DL / UL data as well as DL / UL control data.

[0100] Beamforming may be supported and the beam direction may be dynamically configured. MIMO transmission with precoding may also be supported. MIMO configuration in DL may support up to eight transmit antennas with multi-layer DL transmission of up to eight streams and up to two streams per UE. Multi-layer transmission with up to two streams per UE may be supported. Aggregation of multiple cells may be supported with up to eight serving cells. Alternatively, NR may support different air interfaces other than OFDM-based interfaces. The NR network may include entities such as a central unit or distributed units.

[0101] As noted above, Figure 4 is provided as an example. Other examples may differ from those described with respect to Figure 4.

[0102] In a wireless network, a UE may communicate with a BS using various types of radio frequency spectrum. In some cases, the UE and the BS may communicate using a licensed radio frequency spectrum, which may include radio frequency spectrum that may be licensed to a wireless network operator for use in cellular communications. The licensed radio frequency spectrum may be configured into multiple channels having respective channel frequencies and respective channel bandwidths.

[0103] The licensed radio frequency spectrum channel may be further configured into a plurality of resource blocks that may be used for uplink and / or downlink communications. The BS may configure the UE to monitor a control region in the licensed radio frequency spectrum channel that includes one or more resource blocks of the plurality of resource blocks for downlink communications (e.g., PDCCH communications). To do so, the BS may transmit information to the UE that identifies a control resource set (core set) for the one or more resource blocks.

[0104] In some cases, the information identifying the core set may include a bitmap. Each bit included in the bitmap may correspond to a group of contiguous resource blocks included in a licensed radio frequency spectrum channel, and each bit may indicate (e.g., by a 1 or 0 value) whether the corresponding resource block group is allocated to the core set. The number of resource blocks included in a resource block group may be referred to as the resource block granularity. As an example, the resource block granularity associated with a licensed radio frequency spectrum channel may be 6 resource blocks per bit.

[0105] The BS may configure a core set for the multiple licensed radio frequency spectrum channels. The core set may be derived based at least in part on a reference frequency (sometimes referred to as point A) in the licensed radio frequency spectrum. The BS may use resource block granularity associated with the licensed radio frequency spectrum channels to assign respective clusters of resource block groups to the multiple licensed radio frequency spectrum channels and to provide gaps between the clusters.

[0106] In some cases, the UE and the BS may communicate using a shared and / or unlicensed radio frequency spectrum, which may include unlicensed and / or shared radio frequency spectrum for various types of uses. Examples of the shared radio frequency spectrum may include industrial, scientific, and medical (ISM) radio frequency bands such as 2.4 GHz and 5 GHz (which may typically be used for Wi-Fi communications). In some cases, the BS and the UE may reuse a channel structure of the shared radio frequency spectrum that is configured for other types of communications. For example, when the BS and the UE communicate over 5 GHz, the BS and the UE may reuse a channel frequency and a channel bandwidth that is configured for Wi-Fi communications. An exemplary channel bandwidth of the shared radio frequency spectrum channel may be 20 MHz. The BS and the UE may be configured to operate in a wide band using multiple adjacent 20 MHz simultaneously. Each 20 MHz channel may be referred to as a shared radio frequency spectrum bandwidth for cellular communications.

[0107] To enable cellular communications to use a channel structure of the shared radio frequency spectrum, the shared radio frequency spectrum bandwidth may be configured into a respective number of resource blocks that may be used for uplink and / or downlink communications. The BS may configure the UE to monitor a control region in the shared radio frequency spectrum bandwidth by sending an indication of a core set (or a configuration for a core set) for a number of resource blocks included in the shared radio frequency spectrum bandwidth to the UE. The control region may comprise one or more resource blocks of the plurality of resource blocks, and the UE may monitor the one or more resource blocks for downlink communications (e.g., PDCCH communications).

[0108] As shown above, the information identifying the core set may include a bitmap. In some cases, the resource block granularity associated with licensed radio frequency spectrum channels may be inefficient for use with shared radio frequency spectrum channels. For example, a shared radio frequency spectrum bandwidth with a channel bandwidth of 20 MHz and a subcarrier spacing of 30 kHz may be configured into 51 resource blocks. The BS may derive the core set for the shared radio frequency spectrum bandwidth (and other shared radio frequency spectrum bandwidths) based at least in part on the reference frequency among the shared radio frequency spectrum carriers and the resource block granularity associated with the licensed radio frequency spectrum channels. Due to the resource block granularity associated with the licensed radio frequency spectrum channels, the resulting resource block group clusters may be positioned such that the resource block group clusters for a particular shared radio frequency spectrum bandwidth are not positioned near the center of the shared radio frequency spectrum bandwidth and / or are positioned outside the shared radio frequency spectrum bandwidth. Moreover, dithering of the reference frequency may shift the location of the resource block group clusters, which may cause the gap between the resource block group clusters to shrink and / or may cause the resource block group clusters to at least partially drift outside the corresponding shared radio frequency spectrum bandwidth.

[0109] In some cases, a finer resource block granularity may be used to allow finer adjustment of resource block group clusters within a core set, however increasing the resource block granularity results in an increased number of bits in the bitmap, which increases the signaling overhead of the bitmap.

[0110] Some aspects described herein provide techniques and apparatus for core set configuration for a shared radio frequency spectrum carrier. In some aspects, rather than deriving the resource block group cluster to be assigned to each shared radio frequency spectrum bandwidth in the core set based at least in part on a reference frequency, the BS and UE may be configured with information identifying a control resource block group configuration (sometimes referred to as a resource block set) for each shared radio frequency spectrum bandwidth. The control resource block group configuration for a particular shared radio frequency spectrum bandwidth may specify one or more parameters for a single control resource block group for the shared radio frequency spectrum bandwidth (rather than a resource block cluster including multiple resource block groups). The one or more parameters may specify the number of resource blocks included in the control resource block group, may specify a starting resource block and an ending resource block for the control resource block group (which may indicate the location of the control resource block group within the shared radio frequency spectrum bandwidth), etc.

[0111] In this way, the BS does not need to configure the control resource block groups based at least in part on the reference frequency or resource block granularity, which reduces the possibility that the control resource block groups overlap or shift outside the corresponding shared radio frequency spectrum bandwidth. Moreover, since each shared radio frequency spectrum bandwidth is associated with a single control resource block group, a single bit in the bitmap for the core set may correspond to a single control resource block group and thus may be used to represent the shared radio frequency spectrum bandwidth. This reduces the number of bits included in the bitmap compared to using multiple bits to indicate multiple resource block groups associated with the shared radio frequency spectrum bandwidth, which reduces the signaling overhead of the bitmap.

[0112] 5A-5C are diagrams illustrating example core set configurations 500 for a shared radio frequency spectrum according to various aspects of the present disclosure. As shown in FIG. 5A-5C, the example 500 may include a user equipment (e.g., UE 120) and a base station (e.g., BS 110). In some aspects, the BS 110 and the UE 120 may be included in a wireless network (e.g., wireless network 100). In some aspects, the BS 110 and the UE 120 may communicate using different radio frequency spectrums, such as a licensed radio frequency spectrum, a shared radio frequency spectrum, etc. In some aspects, the BS 110 and the UE 120 may establish a connection on the shared radio frequency spectrum bandwidth (or channel) by performing an initial access procedure, such as a random access channel (RACH) procedure. The RACH procedure may include a four-step RACH procedure, a two-step RACH procedure, etc.

[0113] 5A, to enable UE 120 to communicatively connect with BS 110, BS 110 may transmit a synchronization signal block (SSB). The SSB may include various synchronization signals, such as a primary synchronization signal (PSS), a secondary synchronization signal (SSS), etc. UE 120 may use the PSS and SSS for cell search and cell acquisition. For example, UE 120 may use the PSS to determine symbol timing and may use the SSS to determine a physical cell identifier associated with BS 110 and frame timing.

[0114] In some aspects, the BS 110 may transmit SSBs using a control resource block group (or resource block group) configured for a shared radio frequency spectrum bandwidth (or channel) among multiple shared radio frequency spectrum bandwidths included in a shared radio frequency spectrum carrier. As indicated above, the BS 110 and the UE 120 may be configured with information identifying a control resource block group configuration for each shared radio frequency spectrum bandwidth. Thus, each control resource block group may be defined for the associated shared radio frequency spectrum bandwidth. The control resource block group configuration for a particular shared radio frequency spectrum bandwidth may specify one or more parameters for a single control resource block group for the shared radio frequency spectrum bandwidth (rather than a resource block cluster including multiple resource block groups). The one or more parameters may specify the number of resource blocks included in the control resource block group (e.g., 48 resource blocks, 50 resource blocks, etc.), a starting resource block and an ending resource block for the control resource block group (which may indicate the location of the control resource block group within the shared radio frequency spectrum bandwidth or channel relative to the shared radio frequency spectrum channel or channel or center frequency of the resource block), etc.

[0115] As shown in FIG. 5B, the control resource block groups may be located within a corresponding shared radio frequency spectrum bandwidth. In some aspects, the center of the control resource block group may be located at or near the channel frequency or center frequency of the shared radio frequency spectrum bandwidth. In some aspects, the center of the control resource block group may be off-center compared to the center frequency or channel frequency of the shared radio frequency spectrum bandwidth. In some aspects, the control resource block groups for multiple shared radio frequency spectrum bandwidths (e.g., bandwidth 1 through bandwidth n) may be spaced apart by a gap of one or more resource blocks to provide guard-banding and to ensure that the control resource block groups do not overlap.

[0116] In some aspects, the BS 110 and the UE 120 may be configured with information identifying a control resource block group configuration when the BS 110 and / or the UE 120 are deployed in a wireless network, may be configured with information identifying a control resource block group configuration via signaling communications (e.g., Radio Resource Control (RRC) communications, Media Access Control-Control Element (MAC-CE) communications, Downlink Control Information (DCI) communications, etc.), etc. In some aspects, the information identifying a control resource block group configuration may be included in a data structure, such as a table, a database, a specification, and an electronic file, may be included in a memory device, may be hard-coded into a circuit or processor, etc.

[0117] In some aspects, the UE 120 may use the transmission of an SSB in the shared radio frequency spectrum bandwidth as an implicit indication that a control resource block group associated with the shared radio frequency spectrum bandwidth is included in an initial access (or random access) core set for the BS 110. That is, the UE 120 may detect that an SSB is being transmitted in the shared radio frequency spectrum bandwidth, perform a lookup in a data structure that includes information identifying a control resource block group configuration, and identify the control resource block group based at least in part on performing the lookup. In this manner, the BS 110 may not need to perform additional signaling to indicate the initial access core set to the UE 120, which reduces processing, memory, and / or radio resources that would otherwise be consumed by transmitting signaling to indicate the initial access core set.

[0118] As further shown in FIG. 5B by reference numeral 504, UE 120 and BS 110 may perform an initial access procedure using a control resource block group configured for the shared radio frequency spectrum bandwidth to which the SSB was transmitted. UE 120 may initiate the initial access procedure using the SSB based at least in part on identifying the SSB. For example, UE 120 may identify a RACH occasion associated with the SSB and may select a RACH preamble in the RACH occasion. UE 120 may transmit a RACH communication in the RACH occasion (e.g., a msg1 communication in a four-step RACH procedure, a msgA communication in a two-step RACH procedure, etc.), and the RACH communication may identify a RACH preamble.

[0119] The UE 120 may monitor resource blocks included in the control resource block group to receive PDCCH communication from the BS 110 in the resource blocks using the control resource block group configured for the shared radio frequency spectrum bandwidth for which the SSB was transmitted. In some aspects, the UE 120 may identify the control resource block group based at least in part on the BS 110 transmitting an SSB for the shared radio frequency spectrum bandwidth associated with the control resource block group. The UE 120 may identify the control resource block group based at least in part on an association between the control resource block group and the shared radio frequency spectrum bandwidth being hard-coded in a data structure, such as a table, database, specification, electronic file, etc., configured in the UE 120. The PDCCH communication may include a RACH communication, such as a msg2 communication in a four-step RACH procedure, a msgB communication in a two-step RACH procedure, etc.

[0120] As further indicated in FIG. 5B by reference numeral 506, the BS 110 may transmit an indication of a core set (e.g., a concatenated core set) for one or more shared radio frequency spectrum bandwidths to the UE 120. The BS 110 may transmit the indication of the core set based at least in part on the initial access procedure. For example, the BS 110 may transmit the indication of the core set during the initial access procedure, after the initial access procedure is completed, etc. In some aspects, the BS 110 may transmit the indication of the core set in a signaling communication, such as an RRC communication, a MAC-CE communication, a DCI communication, and / or another type of signaling communication.

[0121] Once a connection between BS 110 and UE 120 is established, a core set may be a wideband core set used by UE 120 for connected access, regular access, and / or normal access. In this manner, a core set may configure UE 120 to monitor a control region including multiple resource blocks spanning multiple subbands to receive downlink communications (e.g., PDCCH communications). A core set may comprise the entire downlink bandwidth part (BWP) allocated to UE 120, or a portion of the downlink BWP.

[0122] As further shown in FIG. 5B, the core set indication may identify a control resource block group and a corresponding shared radio frequency spectrum bandwidth that is included in the core set. In some aspects, the shared radio frequency spectrum bandwidth may include the shared radio frequency spectrum bandwidth used by the UE 120 for initial access or random access, may include one or more other shared radio frequency spectrum bandwidths, etc. In this manner, the control resource block group used for the initial access procedure may be used as a building block for the core set.

[0123] The indication of the core set may include a bitmap or another type of indication. The bitmap may be included in a configuration, such as a core set configuration, a search space set configuration, and / or another type of configuration, for the core set. The bitmap may include a plurality of bits, where each bit of the plurality of bits corresponds to a respective control resource block group (and corresponding shared radio frequency spectrum bandwidth). The value of the bit may indicate whether the corresponding control resource block group is included in the core set. For example, a bit having a first value (e.g., a value of 1) may indicate that the corresponding control resource block group is included in the core set. As another example, a bit having a second value (e.g., a value of 0) may indicate that the corresponding control resource block group is not included in the core set. In the example shown in FIG. 5B, the exemplary bitmap may indicate that the control resource block groups corresponding to bandwidth 1, bandwidth 2, bandwidth 4, and bandwidth 5 are included in the core set, and that the control resource block groups corresponding to bandwidth 3 and bandwidth n are not included in the core set. Thus, in this example, from left to right, each bit in the bitmap may correspond to a control resource block group of increasing frequency (e.g., the first bit in the bitmap may correspond to the control resource block group of the lowest frequency, the second bit in the bitmap may correspond to the control resource block group of the next highest frequency, and so on).

[0124] In some aspects, the BS 110 may transmit a demodulation reference signal (DMRS) in the shared radio frequency spectrum bandwidth. In some cases, the DMRS scrambling of the DMRS may be a function of the timing of the transmission of the DMRS and a cell identifier associated with the BS 110. In some cases, the DMRS scrambling may be determined based on a reference frequency. However, in this case, the DMRS sequence in a particular control resource block group may change from the control resource block group used for initial access by the UE 120 if the control resource block group is used for a wideband core set for another UE.

[0125] 5C, rather than determining the DMRS scrambling from a reference frequency for the wideband core set, the BS 110 may assign a respective DMRS scrambling sequence to each shared radio frequency spectrum bandwidth. In this manner, the BS 110 may scramble a DMRS transmitted in a particular shared radio frequency spectrum bandwidth based at least in part on the DMRS scrambling sequence associated with the shared radio frequency spectrum bandwidth.

[0126] The DMRS scrambling sequence for a particular shared radio frequency spectrum bandwidth may be determined based at least in part on a function of a cell identifier associated with BS 110, a time of transmission of the DMRS, and a channel identifier associated with the shared radio frequency spectrum bandwidth. The DMRS scrambling sequence may be filled into the DMRS resource elements starting with the lowest resource element in the control resource block group associated with the shared radio frequency spectrum bandwidth.

[0127] As an example, for an initial access core set in which bandwidth 4 of a shared radio frequency spectrum is selected for initial access, BS 110 may scramble the DMRS transmitted in the control resource block group associated with bandwidth 4 based at least in part on the DMRS scrambling sequence for bandwidth 4. As another example, for a concatenated core set including bandwidths 1, 2, 4, and 5 of a shared radio frequency spectrum carrier, BS 110 may scramble the DMRS transmitted in the control resource block group associated with bandwidth 1 based at least in part on the DMRS scrambling sequence for bandwidth 1, and may scramble the DMRS transmitted in the control resource block group associated with bandwidth 2 based at least in part on the DMRS scrambling sequence for bandwidth 2, and so on. BS 110 may configure various configurations of initial access core sets and concatenated core sets based at least in part on the techniques described above, may configure various configurations of DMRS and / or DMRS scrambling sequences based at least in part on the techniques described above, and so on.

[0128] In some aspects, the UE 120 may receive an indication of a core set or configuration and may use the indication of the core set or configuration to identify the control resource block groups (and thus the shared radio frequency spectrum bandwidth) included in the core set. For example, the UE 120 may identify a bitmap included in the configuration and determine the respective values ​​of the bits included in the bitmap to determine or identify the inclusion of the control resource block groups in the core set. As an example, the UE 120 may determine that a bit having a 1 value indicates that the corresponding control resource block group is included in the core set and that a bit having a 0 value indicates that the corresponding control resource block group is not included in the core set. As another example, the UE 120 may determine that a bit having a 0 value indicates that the corresponding control resource block group is included in the core set and that a bit having a 1 value indicates that the corresponding control resource block group is not included in the core set. Other examples and / or indicators may be used to indicate whether a control resource block group is included in a core set.

[0129] In some aspects, the BS 110 and the UE 120 may communicate based at least in part on the control resource block group included in the core set. For example, the UE 120 may identify each of the resource blocks included in the control resource block group included in the core set based at least in part on a control resource block configuration configured in the UE 120. For example, the UE 120 may determine that the control resource block group associated with the bandwidth 1 is included in the core set, may identify a control resource block group configuration for the control resource block group, and may identify the resource blocks included in the control resource block group based at least in part on a starting resource block and an ending resource block indicated in the control resource block group configuration. The UE 120 may monitor a control region including a plurality of resource blocks for PDCCH communication transmitted from the BS 110, and the BS 110 may transmit the PDCCH communication to the UE 120 in the plurality of resource blocks.

[0130] In this manner, the BS 110 and the UE 120 may be configured with information identifying the control resource block group configuration for each shared radio frequency spectrum bandwidth. In this manner, the BS 110 does not need to configure the control resource block groups based at least in part on a reference frequency or resource block granularity, which reduces the possibility that the control resource block groups may overlap and / or shift outside the corresponding shared radio frequency spectrum bandwidth. Moreover, since each shared radio frequency spectrum bandwidth is associated with a single control resource block group, a single bit in the bitmap for the core set may correspond to a single control resource block group and thus may be used to represent the shared radio frequency spectrum bandwidth. This reduces the number of bits included in the bitmap compared to using multiple bits to indicate multiple resource block groups associated with the shared radio frequency spectrum bandwidth, which reduces the signaling overhead of the bitmap.

[0131] As noted above, Figures 5A-5C are provided as an example, and other examples may differ from those described with respect to Figures 5A-5C.

[0132] 6 illustrates an example process 600, performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 600 is an example in which a UE (e.g., UE 120) performs operations related to core set configuration for a shared radio frequency spectrum.

[0133] 6, in some aspects, process 600 may include identifying an SSB to be transmitted for the first shared radio frequency spectrum channel (block 610). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may identify an SSB for the first shared radio frequency spectrum channel as described above.

[0134] 6, in some aspects, the process 600 may include identifying a first control resource block group associated with the first shared radio frequency spectrum channel (block 620). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may identify the first control resource block group associated with the first shared radio frequency spectrum channel as described above.

[0135] 6, in some aspects, the process 600 may include performing an initial access procedure using the first control resource block group (block 630). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may perform the initial access procedure using the first control resource block group as described above.

[0136] As further shown in FIG. 6, in some aspects, the process 600 may include receiving an indication of a core set for the first shared radio frequency spectrum channel and the second shared radio frequency spectrum channel based at least in part on the initial access procedure, the indication of the core set identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel (block 640). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may receive an indication of a core set for the first shared radio frequency spectrum channel and the second shared radio frequency spectrum channel based at least in part on the initial access procedure, as described above. In some aspects, the indication of the core set identifies a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0137] Process 600 may include additional aspects, such as any single implementation or any combination of the aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0138] In some aspects, the UE is configured with information identifying the number of resource blocks included in the first control resource block group and the second control resource block group. In some aspects, the UE is configured with information identifying a respective starting resource block and a respective ending resource block for the first control resource block group and the second control resource block group. In some aspects, the UE is configured with information identifying a first location within the core set of the first control resource block group for a first channel frequency associated with the first shared radio frequency spectrum channel and a second location within the core set of the second control resource block group for a second channel frequency associated with the second shared radio frequency spectrum channel.

[0139] In some aspects, the indication of the core set is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the indication of the core set comprises a plurality of bits included in a bitmap. In some aspects, a first bit of the plurality of bits corresponds to a first control resource block group. In some aspects, a second bit of the plurality of bits corresponds to a second control resource block group.

[0140] In some aspects, the process 600 comprises receiving a PDCCH communication in a core set. In some aspects, performing an initial access procedure using a first control resource block group comprises receiving a PDCCH communication in the first control resource block group during the initial access procedure. In some aspects, the process 600 comprises receiving a first DMRS in the first control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum channel, and receiving a second DMRS in a second control resource block group, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum channel. In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with a base station (BS) that transmitted the indication of the core set, a timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum channel. In some aspects, the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of the transmission of the second DMRS, and a channel identifier associated with the first shared radio frequency spectrum channel.

[0141] 6 illustrates example blocks of process 600, in some aspects process 600 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently than those illustrated in FIG 6. Additionally or alternatively, two or more of the blocks of process 600 may be performed in parallel.

[0142] 7 illustrates an example process 700, performed, for example, by a BS, in accordance with various aspects of the present disclosure. The example process 700 is an example in which a BS (e.g., BS 110) performs operations related to core set configuration for a shared radio frequency spectrum.

[0143] 7, in some aspects, process 700 may include transmitting an SSB for the first shared radio frequency spectrum channel (block 710). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit an SSB for the first shared radio frequency spectrum channel as described above.

[0144] 7, in some aspects, the process 700 may include transmitting an indication of a core set for the first shared radio frequency spectrum channel and the second shared radio frequency spectrum channel based at least in part on the initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, the indication of the core set identifying a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel (block 720). For example, the BS (e.g., using the transmit processor 220, the receive processor 238, the controller / processor 240, the memory 242, etc.) may transmit an indication of a core set for the first shared radio frequency spectrum channel and the second shared radio frequency spectrum channel based at least in part on the initial access procedure using a first control resource block group associated with the first shared radio frequency spectrum channel, as described above. In some aspects, the core set indication identifies a first control resource block group configured for the first shared radio frequency spectrum channel and a second control resource block group configured for the second shared radio frequency spectrum channel.

[0145] Process 700 may include additional aspects, such as any single implementation or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0146] In some aspects, the BS is configured with information identifying the number of resource blocks included in the first control resource block group and the second control resource block group, In some aspects, the BS is configured with information identifying a respective starting resource block and a respective ending resource block for the first control resource block group and the second control resource block group.

[0147] In some aspects, the BS is configured with information identifying a first location within the core set of a first control resource block group for a first channel frequency associated with a first shared radio frequency spectrum channel and a second location within the core set of a second control resource block group for a second channel frequency associated with a second shared radio frequency spectrum channel.

[0148] In some aspects, the indication of the core set is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In some aspects, the indication of the core set comprises a plurality of bits included in a bitmap. In some aspects, a first bit of the plurality of bits corresponds to a first control resource block group. In some aspects, a second bit of the plurality of bits corresponds to a second control resource block group.

[0149] In some aspects, the process 700 comprises transmitting a PDCCH communication in a core set. In some aspects, the process 700 comprises performing an initial access procedure using a first control resource block group, and performing the initial access procedure using the first control resource block group comprises transmitting a PDCCH communication in the first control resource block group during the initial access procedure. In some aspects, the process 700 comprises transmitting a first DMRS in the first control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum channel, and transmitting a second DMRS in a second control resource block group, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum channel. In some aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of a transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum channel. In some aspects, the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of a transmission of the second DMRS, and a channel identifier associated with the first shared radio frequency spectrum channel.

[0150] Although Figure 7 illustrates example blocks of process 700, in some aspects process 700 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently than those illustrated in Figure 7. Additionally or alternatively, two or more of the blocks of process 700 may be performed in parallel.

[0151] The above disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the embodiments.

[0152] 8 illustrates an example process 800, performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 800 is an example in which a UE (e.g., UE 120) performs operations related to configuring a core set for a shared radio frequency spectrum carrier.

[0153] 8, in some aspects, process 800 may include receiving an indication of a configuration for a core set of shared radio frequency spectrum carriers (block 810). For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may receive an indication of a configuration for a core set of shared radio frequency spectrum carriers, as described above.

[0154] 8, in some aspects, process 800 may include identifying a bitmap included in the configuration, with each bit in the bitmap associated with a respective control resource block group (block 820). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may identify a bitmap included in the configuration as described above. In some aspects, each bit in the bitmap is associated with a respective control resource block group.

[0155] 8, in some aspects, process 800 may include identifying one or more control resource block groups included in the core set based at least in part on the values ​​for each bit in the bitmap (block 830). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may identify one or more control resource block groups included in the core set based at least in part on the values ​​for each bit in the bitmap, as described above.

[0156] 8, in some aspects, process 800 may include monitoring for downlink communications among one or more control resource block groups (block 840). For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may monitor for downlink communications among one or more control resource block groups as described above.

[0157] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0158] In a first aspect, the UE is configured with information identifying the number of resource blocks contained in each respective control resource block group. In a second aspect, alone or in combination with the first aspect, the UE is configured with information identifying, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth and a respective ending resource block within the associated shared radio frequency spectrum bandwidth.

[0159] In a third aspect, alone or in combination with one or more of the first and second aspects, a control resource block group of the one or more control resource block groups is positioned off-center in an associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth. In a fourth aspect, alone or in combination with one or more of the first to third aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication.

[0160] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the process 800 includes receiving PDCCH communication in a core set based at least in part on monitoring for downlink communication in one or more control resource block groups. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the process 800 includes identifying an SSB transmitted for a first shared radio frequency spectrum bandwidth of a shared radio frequency spectrum carrier, identifying an initial control resource block group associated with the first shared radio frequency spectrum bandwidth, performing an initial access procedure using the initial control resource block group, and receiving a configuration indication for the core set based at least in part on the initial access procedure.

[0161] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, performing an initial access procedure using an initial control resource block group comprises receiving a PDCCH communication in the initial control resource block group during the initial access procedure. In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 800 includes receiving a first DMRS in the initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum bandwidth, and receiving a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group.

[0162] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS that transmitted the configuration indication to the core set, a timing of the transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with that BS, a timing of the transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth. In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth.

[0163] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, an initiation resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiation resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0164] 8 illustrates example blocks of process 800, in some aspects process 800 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently than those illustrated in FIG 8. Additionally or alternatively, two or more of the blocks of process 800 may be performed in parallel.

[0165] 9 illustrates an example process 900, performed, for example, by a BS, in accordance with various aspects of the present disclosure. The example process 900 is an example in which a BS (e.g., BS 110) performs operations related to configuring a core set for a shared radio frequency spectrum carrier.

[0166] As shown in FIG. 9, in some aspects, the process 900 may include transmitting an indication of a configuration for a core set for a shared radio frequency spectrum carrier, the configuration including a bitmap, each bit in the bitmap being associated with a respective control resource block group, and the bitmap indicating one or more control resource block groups included in the core set (block 910). For example, a BS (e.g., using the transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit an indication of a configuration for a core set for a shared radio frequency spectrum carrier, as described above. In some aspects, the configuration includes a bitmap. In some aspects, each bit in the bitmap is associated with a respective control resource block group. In some aspects, the bitmap indicates one or more control resource block groups included in the core set.

[0167] 9, in some aspects, process 900 may include transmitting a downlink communication in a control resource block group of one or more control resource block groups (block 920). For example, a BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit a downlink communication in a control resource block group of one or more control resource block groups as described above.

[0168] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0169] In a first aspect, the BS is configured with information identifying the number of resource blocks included in each of one or more control resource block groups. In a second aspect, alone or in combination with the first aspect, the BS is configured with information identifying, for each of the control resource block groups, a respective starting resource block in the associated shared radio frequency spectrum bandwidth and a respective ending resource block in the associated shared radio frequency spectrum bandwidth. In a third aspect, alone or in combination with one or more of the first and second aspects, the control resource block groups are positioned off-center in the associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

[0170] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the indication of the configuration is included in at least one of an RRC communication, a MAC-CE communication, or a DCI communication. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the process 900 includes transmitting an SSB for a first shared radio frequency spectrum bandwidth and performing an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth, where performing the initial access procedure using the first control resource block group comprises transmitting a PDCCH communication in the initial control resource block group during the initial access procedure.

[0171] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the process 900 includes transmitting a first DMRS in an initial control resource block group, the first DMRS being scrambled based at least in part on a first DMRS scrambling sequence associated with a first shared radio frequency spectrum channel, and transmitting a second DMRS in the control resource block group, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group. In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the first DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the first DMRS, and a channel identifier associated with the first shared radio frequency spectrum bandwidth, and the second DMRS scrambling sequence is based at least in part on a cell identifier associated with the BS, a timing of transmission of the second DMRS, and a channel identifier associated with the second shared radio frequency spectrum bandwidth.

[0172] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, each of the one or more control resource block groups is configured with a respective control resource block group configuration for the associated shared radio frequency spectrum bandwidth. In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

[0173] 9 illustrates example blocks of process 900, in some aspects process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently than those illustrated in FIG 9. Additionally or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0174] As used herein, the term "component" is intended to be interpreted broadly as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and / or a combination of hardware and software.

[0175] It is apparent that the systems and / or methods described herein may be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods have been described herein without reference to any specific software code. It should be understood that software and hardware may be designed to implement the systems and / or methods based at least in part on the description herein.

[0176] Although particular combinations of features are recited in the claims and / or disclosed herein, these combinations do not limit the disclosure of the various aspects. Indeed, many of these features may be combined in ways not specifically recited in the claims and / or disclosed herein. Although each dependent claim listed below may directly depend on only one claim, the disclosure of the various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to a list of "at least one of" items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to include a, b, c, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0177] No element, act, or instruction used herein should be construed as critical or essential unless expressly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items and may be used interchangeably with "one or more." Additionally, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." When only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, terms such as "has," "have," "having," and the like are intended to be open-ended terms. Additionally, the phrase "based on" is intended to mean "based at least in part on," unless otherwise specified. [Explanation of symbols]

[0178] 100 Wireless Network 102a Macrocell 102b Picocell 102c Femtocell 110 Base Station (BS) 120 User Equipment (UE) 130 Network Controller 212 Data Source 220 Transmit Processor 230 Transmit (TX) Multiple Input Multiple Output (MIMO) Processor 232 Modulator (MOD) / Demodulator (DEMOD) 234 Antenna 236 MIMO Detector 238 Receive Processor 239 Data Sink 240 Controllers / Processors 242 Memory 244 Communication Unit 246 Scheduler 252 Antenna 254 Modulator (MOD) / Demodulator (DEMOD) 256 MIMO detector 258 Receive Processor 260 Data Sink 262 Data Sources 264 Transmit Processor 266 Transmit (TX) Multiple Input Multiple Output (MIMO) Processor 280 Controller / Processor 282 Memory 290 Controller / Processor 292 Memory 294 Communication Unit 300 Frame Structure 410 slot format

Claims

1. 1. A method of wireless communication performed by a user equipment (UE), comprising: receiving a configuration indication for a control resource set (core set) of a shared radio frequency spectrum carrier; Identifying a bitmap included in the composition, each bit in the bitmap being associated with a respective control resource block group; identifying one or more control resource block groups included in the core set based at least in part on values ​​for each bit in the bitmap; monitoring for downlink communications among the one or more groups of control resource blocks; A method for providing the above.

2. The method of claim 1 , wherein the UE is configured with information identifying a number of resource blocks contained in each respective control resource block group.

3. The UE, for each control resource block group, a respective starting resource block within the associated shared radio frequency spectrum bandwidth; and Each ending resource block within the associated shared radio frequency spectrum bandwidth , comprising information identifying The method of claim 1.

4. 2. The method of claim 1, wherein a control resource block group of the one or more control resource block groups is positioned off-center within an associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

5. The indication of the configuration: Radio Resource Control (RRC) communications, Media Access Control-Control Element (MAC-CE) communication, or Downlink Control Information (DCI) Communication Included in at least one of The method of claim 1.

6. receiving a physical downlink control channel (PDCCH) communication in the core set based at least in part on monitoring for downlink communication in the one or more control resource block groups. The method of claim 1 , further comprising:

7. identifying a synchronization signal block (SSB) transmitted on a first shared radio frequency spectrum bandwidth of the shared radio frequency spectrum carrier; identifying an initial control resource block group associated with the first shared radio frequency spectrum bandwidth; performing an initial access procedure using the initial control resource block group; receiving the indication of the configuration for the core set based at least in part on the initial access procedure; The method of claim 1 , further comprising:

8. performing the initial access procedure using the initial control resource block group, receiving a physical downlink control channel (PDCCH) communication in the initial control resource block group during an initial access procedure. The method of claim 7.

9. receiving a first demodulation reference signal (DMRS) in the initial control resource block group, scrambling the first DMRS based at least in part on a first DMRS scrambling sequence associated with an initial shared radio frequency spectrum bandwidth; receiving a second DMRS in a control resource block group of the one or more control resource block groups based at least in part on monitoring for downlink communications in the one or more control resource block groups; the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with another shared radio frequency spectrum bandwidth associated with the control resource block group; The method of claim 7, further comprising:

10. the first DMRS scrambling sequence being: A cell identifier associated with a base station (BS) that sent the indication of the configuration for the core set; a timing of transmission of the first DMRS; and based at least in part on a channel identifier associated with the initial shared radio frequency spectrum bandwidth; the second DMRS scrambling sequence being: the cell identifier associated with the BS; a timing of transmission of the second DMRS; and based at least in part on a channel identifier associated with the other shared radio frequency spectrum bandwidth; The method of claim 9.

11. The method of claim 1 , wherein each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth.

12. 2. The method of claim 1, wherein an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

13. A method of wireless communication performed by a base station (BS), comprising: transmitting a configuration indication for a control resource set (core set) for a shared radio frequency spectrum carrier; the configuration comprises a bitmap; each bit in the bitmap is associated with a respective control resource block group; the bitmap indicating one or more control resource block groups included in the core set; transmitting downlink communications in a control resource block group of the one or more control resource block groups; A method for providing the above.

14. The method of claim 13, wherein the BS is configured with information identifying a number of resource blocks included in each of the one or more control resource block groups.

15. The BS, for each of the control resource block groups, a respective starting resource block within the associated shared radio frequency spectrum bandwidth; and Each ending resource block within the associated shared radio frequency spectrum bandwidth , comprising information identifying The method of claim 13.

16. The method of claim 13 , wherein the control resource block groups are positioned off-center within an associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

17. The indication of the configuration: Radio Resource Control (RRC) communications, Media Access Control-Control Element (MAC-CE) communication, or Downlink Control Information (DCI) Communication Included in at least one of The method of claim 13.

18. transmitting a synchronization signal block (SSB) for a first shared radio frequency spectrum bandwidth; performing an initial access procedure using an initial control resource block group in the first shared radio frequency spectrum bandwidth; performing the initial access procedure using a first group of control resource blocks, transmitting a physical downlink control channel (PDCCH) communication in the initial control resource block group during an initial access procedure. The method of claim 13.

19. transmitting a first demodulation reference signal (DMRS) in the initial control resource block group, scrambling the first DMRS based at least in part on a first DMRS scrambling sequence associated with the first shared radio frequency spectrum bandwidth; transmitting a second DMRS in the control resource block group, the second DMRS being scrambled based at least in part on a second DMRS scrambling sequence associated with a second shared radio frequency spectrum bandwidth associated with the control resource block group; 20. The method of claim 18, further comprising:

20. the first DMRS scrambling sequence being: A cell identifier associated with said BS; a timing of the transmission of the first DMRS; and based at least in part on a channel identifier associated with the first shared radio frequency spectrum bandwidth; the second DMRS scrambling sequence being: the cell identifier associated with the BS; a timing of the transmission of the second DMRS; and based at least in part on a channel identifier associated with the second shared radio frequency spectrum bandwidth; 20. The method of claim 19.

21. The method of claim 13, wherein each of the one or more control resource block groups is configured according to a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth.

22. 14. The method of claim 13, wherein an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

23. A user equipment (UE) for wireless communications, comprising: Memory, one or more processors coupled to the memory, receiving a configuration indication for a control resource set (core set) of a shared radio frequency spectrum carrier; identifying a bitmap included in said composition, identifying, each bit in the bitmap associated with a respective control resource block group; identifying one or more control resource block groups included in the core set based at least in part on values ​​for each bit in the bitmap; and monitoring for downlink communications among said one or more control resource block groups. One or more processors A user equipment comprising:

24. 24. The UE of claim 23, wherein a control resource block group of the one or more control resource block groups is positioned off-center within an associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

25. 24. The UE of claim 23, wherein each of the one or more control resource block groups is configured with a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth.

26. 24. The UE of claim 23, wherein a starting resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of a starting resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

27. A base station (BS) for wireless communications, comprising: Memory, one or more processors coupled to the memory, Transmitting a configuration indication for a control resource set (core set) for a shared radio frequency spectrum carrier, the configuration comprises a bitmap; each bit in the bitmap is associated with a respective control resource block group; transmitting the bitmap indicating one or more control resource block groups included in the core set; and transmitting downlink communications in a control resource block group of the one or more control resource block groups. One or more processors A base station comprising:

28. 28. The BS of claim 27, wherein a control resource block group of the one or more control resource block groups is positioned off-center within an associated shared radio frequency spectrum bandwidth compared to a center frequency of the shared radio frequency spectrum bandwidth.

29. 28. The BS of claim 27, wherein each of the one or more control resource block groups is configured with a respective control resource block group configuration for an associated shared radio frequency spectrum bandwidth.

30. 28. The BS of claim 27, wherein an initiating resource block for a first control resource block group is located at a different location within the associated first shared radio frequency spectrum bandwidth compared to a location of an initiating resource block for a second control resource block group within the associated second shared radio frequency spectrum bandwidth.

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